On the theory of the second optical harmonic in nonlinear crystals with a regular domain structure

The theory of the second-harmonic generation in crystals with a regular domain structure (RDS) is developed in the approximation of the fixed intensity of the fundamental radiation. An analytical expression for the second-harmonic intensity is derived. The results are compared with the data obtained in the fixed-field approximation and the numerical solution. The maximum number of layers n max at which the theory remains valid is determined. Numerical estimates of n max are presented for the frequency doubling of an ultrashort light pulse in the LiNbO3 RDS crystal.

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